uuid.go

Documentation: github.com/gogo/protobuf/test/combos/marshaler

     1  // Protocol Buffers for Go with Gadgets
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     3  // Copyright (c) 2013, The GoGo Authors. All rights reserved.
     4  // http://github.com/gogo/protobuf
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    14  // in the documentation and/or other materials provided with the
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    24  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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    26  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    27  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    28  
    29  package test
    30  
    31  import (
    32  	"bytes"
    33  	"encoding/hex"
    34  	"encoding/json"
    35  )
    36  
    37  func PutLittleEndianUint64(b []byte, offset int, v uint64) {
    38  	b[offset] = byte(v)
    39  	b[offset+1] = byte(v >> 8)
    40  	b[offset+2] = byte(v >> 16)
    41  	b[offset+3] = byte(v >> 24)
    42  	b[offset+4] = byte(v >> 32)
    43  	b[offset+5] = byte(v >> 40)
    44  	b[offset+6] = byte(v >> 48)
    45  	b[offset+7] = byte(v >> 56)
    46  }
    47  
    48  type Uuid []byte
    49  
    50  func (uuid Uuid) Bytes() []byte {
    51  	return uuid
    52  }
    53  
    54  func (uuid Uuid) Marshal() ([]byte, error) {
    55  	if len(uuid) == 0 {
    56  		return nil, nil
    57  	}
    58  	return []byte(uuid), nil
    59  }
    60  
    61  func (uuid Uuid) MarshalTo(data []byte) (n int, err error) {
    62  	if len(uuid) == 0 {
    63  		return 0, nil
    64  	}
    65  	copy(data, uuid)
    66  	return 16, nil
    67  }
    68  
    69  func (uuid *Uuid) Unmarshal(data []byte) error {
    70  	if len(data) == 0 {
    71  		uuid = nil
    72  		return nil
    73  	}
    74  	id := Uuid(make([]byte, 16))
    75  	copy(id, data)
    76  	*uuid = id
    77  	return nil
    78  }
    79  
    80  func (uuid *Uuid) Size() int {
    81  	if uuid == nil {
    82  		return 0
    83  	}
    84  	if len(*uuid) == 0 {
    85  		return 0
    86  	}
    87  	return 16
    88  }
    89  
    90  func (uuid Uuid) MarshalJSON() ([]byte, error) {
    91  	s := hex.EncodeToString([]byte(uuid))
    92  	return json.Marshal(s)
    93  }
    94  
    95  func (uuid *Uuid) UnmarshalJSON(data []byte) error {
    96  	var s string
    97  	err := json.Unmarshal(data, &s)
    98  	if err != nil {
    99  		return err
   100  	}
   101  	d, err := hex.DecodeString(s)
   102  	if err != nil {
   103  		return err
   104  	}
   105  	*uuid = Uuid(d)
   106  	return nil
   107  }
   108  
   109  func (uuid Uuid) Equal(other Uuid) bool {
   110  	return bytes.Equal(uuid[0:], other[0:])
   111  }
   112  
   113  func (uuid Uuid) Compare(other Uuid) int {
   114  	return bytes.Compare(uuid[0:], other[0:])
   115  }
   116  
   117  type int63 interface {
   118  	Int63() int64
   119  }
   120  
   121  func NewPopulatedUuid(r int63) *Uuid {
   122  	u := RandV4(r)
   123  	return &u
   124  }
   125  
   126  func RandV4(r int63) Uuid {
   127  	uuid := make(Uuid, 16)
   128  	uuid.RandV4(r)
   129  	return uuid
   130  }
   131  
   132  func (uuid Uuid) RandV4(r int63) {
   133  	PutLittleEndianUint64(uuid, 0, uint64(r.Int63()))
   134  	PutLittleEndianUint64(uuid, 8, uint64(r.Int63()))
   135  	uuid[6] = (uuid[6] & 0xf) | 0x40
   136  	uuid[8] = (uuid[8] & 0x3f) | 0x80
   137  }
   138
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